$-\left(-5\:+\:6\:+\:6\right)\:+\:3\:-\:\left(+5\:-\:2\:+\:1\right)$
$y^2+2+4$
$a^2-9a+117$
$\sqrt{-287}$
$6b-4b+9b-3b+7+b$
$3x^5+6x^5+7x^5$
$\int e^{-x}-\cos\left(2x\right)dx$
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